Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a4c9f91d99892f…

MALICIOUS

PDF

98.2 KB Created: 2021-07-14 09:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b972a7a39199d1c81c45e5007f06766a SHA-1: 847ccaf5037dd62ac243c64739eb6b8901af854f SHA-256: 74a4c9f91d99892f1c40c298b4447b89dae916bd97ed421f37366f977d9310d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to other PDF files hosted on compromised CMS uploads, indicating a link farm designed to distribute malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/cd94270eaff27f6fef98c4b773b0559a/jofavigib.pdf In PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/zanora.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/85109021435.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ae25ab9aab7b847f396dabddf6550ac3/8490309573.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5990f9553181c540db69004c1638a928/lemimetotavoxijuloseki.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/tapegaxuwuvojazepujedek.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/79483064856.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/a0d7669da03a22cf0845770435ac4f2f/vobubedepitozisarize.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/mesiganovifukoxemavewiba.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086964b0b631---1070969294.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/16784548291.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/karaw.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p1odiqj0j1tcc820pihun1ue1s/kubofajuxeket.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/gobik.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6291eaa46c---56739147248.pdfIn PDF document text
    • http://sushi-belovo.ru/files/30812629430.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jefonorukepatuxixu.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/62071827507.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b824a53835661318ceee7b6549c24ffe/tedomojudaj.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/95dc1ee68d5a4585105dd70d0e533e42/58907224909.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/77436222835.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jotejewarofazugekotuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=in+reversed+phase+hplc+there+is+aPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001329b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 18344 bytes
SHA-256: 2eac2460ae0b2eeb3fd5d6b6e4b38a2704690103a6578e4340248ef840fe09fd
font_02_sfnt_off00016392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16392 10508 bytes
SHA-256: 40264b898ff75ea46c136429fe437a4d889cf2f14a844f46bdfc56c9ba9ad3d3

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